Like most performance parameters of concrete, cracking potential is also significantly affected by the binder type. ... [19] and 50 % fly ash [20] compared to OPC concrete. Fly ash is also reported to reduce the tendency of thermal cracking [21], [22]. ... Several methods have been suggested for determining cracking potential parameters, ...
The combined effect of various parameters on the strength of geopolymer concrete based on GGBS and fly ash was represented by the proposal of a parameter called "Binder Index (Bi)" Rama Seshu et al. . However, the proposed binder index takes into account the variation of few variations like molarity and ratio of source materials.
All alkali-activated fly ash pastes were designed to have similar workability. Flow tests as for hydraulic cement mortar was adopted for alkali-activated fly ash pastes (ASTM C 1437, 2001). The water-to-fly ash ratio was chosen for each fly ash such that the flow of the alkali-activated fly ash paste would be in the range of 170–180 mm.
A cement mortar mix with a cement-to-sand ratio of 1:3 was investigated, including fly ash replacement from 10% to 40%, and GGBS from 10% to 70% of the weight of the cement. A suitable blend …
The compressive strength of fly ash concrete at 30% replacement after 28 days is 36.9 N/mm2 which is lesser than conventional concrete by 6.81%.Activated fly ash concrete has higher compressive strength compared to conventional & fly ash concrete. The compressive strength increases by 6.16% & 12.5% higher than CVC & Fly ash …
Similarly, the utilization of fly ash in concrete has several benefits, including the mitigation of shrinkage, ... The dataset included the depth of wear as the target variable and nine explanatory parameters: fly ash, cement content, fine and coarse aggregate, water content, plasticizer, age of concrete, air-entraining agent, and testing time. ...
Additionally, alternative binders such as lime, fly ash, or industrial by-products can be combined with cement and applied as stabilizers, as reported in several previous investigations 22,23,24.
Cement-fly ash-gravel (CFG) piles comprise one of the novel ground-improvement methods. They are attracting considerable attention, as their beneficial role in accessible soft foundations is being increasingly exploited by the surging urban industrial development in China. ... Several two-parameter marginal probability distributions …
This review article aims to illustrate how these various parameters affect the compressive strength of fly ash-based geopolymer concrete (FAGPC). To accomplish …
1. Introduction. Cement is one of the most widely used building materials on a global scale. It is primarily used in concrete manufacturing [1, 2].Furthermore, cement production is a significant source of carbon dioxide (CO 2), posing a significant environmental risk [3].One ton of cement produces between 0.6 and 1 ton of CO 2 [4], …
Disposal of the coal fly ash (CFA) generated from thermal power plants in huge quantities is one of the major concerns for the industry, as well as the natural environment. On the other hand, CFA can be used within a certain percentage range in the cement concrete mix as a replacement for cement. Nanomaterials can also be used to …
Therefore, using fly ash as a partial replacement for cement in grouting material has emerged as a research focus among scholars. Fly ash is primarily a fine solid powder composed of flue gas ash resulting from fuel combustion in power plants and industrial waste [17].The effective utilization of fly ash has addressed China's industrial …
The preparation of wet shotcrete samples is carried out according to the orthogonal test scheme. Firstly, waste rock, tail sand and fly ash are mixed and dry mixed evenly according to the design parameters. Secondly, after the aggregate and fly ash are evenly mixed, cement is added for further mixing.
1.2. Research objectives. The ASTM C1827-20 index is related to a combination of ing efficiency and ing stability of the AEA in the fly …
This research paper presents a detailed investigation into the use of waste fly ash–based lightweight aggregate developed by a sintering process in concrete. These …
fly ash concrete. II. LITERATURE & REVIEW 1.Sunilaa George & Dr. R.Thenmozhi (2011) [1] [2]: Studied the behavior of Activated fly ash concrete. The effectiveness of fly ash activation by CaOand Na2SiO3 is verified by scanned electron microscope. Scanning electron microscopy shows that FA is composed mainly
The results of this research show that high-alkali biofuel fly ash (BFA) had a significant influence on the mechanical characteristics, microstructure, porosity, freezing–thawing cycle resistance, and ASR resistance of cementitious materials. Different amounts of BFA (varying from 0 to 30%) were used as a substitute for cement in …
Fig. 8 also illustrates cement, superplasticizer, and age of the concrete are positively correlated with compressive strength, and the remaining other parameters are inversely correlated with the strength of the concrete, which denotes compressive strength of concrete decreases with the increase in water, fly ash, fine aggregate, and coarse ...
It can be inferred from Figure 1 and the kurtosis values in Table 1 that the distribution of several input parameters such as the amount of cement, F.ag., C.ag., ... Different variables such as the quantity of cement, fly ash, rice husk ash, fine and coarse aggregates, water, and superplasticizer and the age of the samples were considered to ...
Modification of a cement matrix using additives and admixtures has been a common practice for many years. The use of some mineral additives as substitutes for the cement, e.g., the siliceous fly ashes (FAs), has a positive effect on reducing the energy used in cement production. On the other hand, such activities may have negative …
This study presents test results and deep discussion regarding measurements of the fracture toughness of new concrete composites based on ternary blended cements (TCs). A composition of the most commonly used mineral additive (i.e., fly ash (FA)) in combination with nano-silica (NS) has been proposed as a partial …
Over the past two decades, concrete manufacturing has experimented with various supplementary cementitious materials (SCMs) to enhance sustainability, performance, and durability [13] such as fly ash [14], corn cob ash [15], rice husk ash [16], metakaolin [8].These materials consume less than ordinary Portland cement, which is …
There are various waste materials and by-products that can be used as replacement of cement in the concrete mixture, such as cement kiln dust, blast furnace slag, fly ash, silica fume, recycled ...
Fly ash, as a major solid waste in China, is currently used mainly in the building materials industry. Yong L et al [36] used fly ash (FA), desulfurized gypsum (DG) and red mud (RM) as raw materials and found that the roadbed material prepared by RM-FA-DG composites was cured for 7 d at (CaO+Na 2 O)/(SiO 2+ Al 2 O 3)=0.88, which …
Abstract. Development of sustainable concrete as an alternative to conventional concrete helps in reducing carbon dioxide footprint associated with the …
Particle size analysis of cement, fly ash and calcium carbonate before calcination and. Download ... The study evaluated the flexural strength of several …
Then, the degree of hydration of cement and degree of reaction of fly ash can be calculated through [18], [22], [23]: (4) α = 1-V i V 0 where α is the degree of hydration of cement or the degree of reaction of fly ash; V i is the area/volume fraction of residual cement or fly ash; V 0 is the initial area/volume fraction of cement or fly ash.
Also, the pH value for all the mixes was observed to be greater than 11. Deicing salt surface scaling weight loss increased with the increase in fly ash content except with mix containing 15% fly ash. At 365 days age, the weight loss was almost consistent for all percentages of fly ash varying between 0.525 and 0.750 kg/m 2.
The study identified optimized sediment/cement/fly ash mixtures for effective road construction ... The study emphasizes key parameters such as resilient modulus, swelling behavior, strength, specific surface area (SSA), and cation exchange capacity (CEC) as crucial indicators of soil performance. ... Since multiple F-T cycles, the …
During past few decades, due to environmental and economic issues, Fly ash has got a prominence role as an alternative construction material [15]. The benefits of utilization of Fly ash as a construction material are still to be addressed. It is observed that, the geotechnical behaviour of Fly ash mixed with fibers was significant [8].
The results of the research indicate that water cement ratio (w/c) 0.4, polymer concrete ratio (P/C) 15% and rice husk fly ash portland cement ratio 15% gives the best performance.
